An Augustinian priest of the Cascia region, called to bring Viaticum to a sick farmer, hurriedly placed the consecrated host between the pages of his breviary rather than in the usual pyx. When he reached the farm and opened the book, he found both pages soaked with blood — one with the perfect imprint of the host.
Filled with remorse, the priest brought the bloodied pages to the prior of the Augustinians at Siena, who consulted Pope John XXII at Avignon. The pages were authenticated and entrusted for veneration. They are still preserved at the Basilica of St. Rita in Cascia (the same town in Umbria as St. Rita herself, the famous mystic and saint of impossible causes, who lived a century later).